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Respiratory System - PowerPoint PPT Presentation


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Respiratory System. Function. Gas exchange between air, blood, and tissues Oxygen in and carbon dioxide out Speech Coughing, sneezing, hiccupping, yawning. Important structures. Nose/mouth : openings through which air can come in Pharynx : (throat) passageway for both food and air

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function
Function
  • Gas exchange between air, blood, and tissues
  • Oxygen in and carbon dioxide out
  • Speech
  • Coughing, sneezing, hiccupping, yawning
important structures
Important structures
  • Nose/mouth: openings through which air can come in
  • Pharynx: (throat) passageway for both food and air
  • Larynx: (voice box) vocal cords, speech
  • Trachea: (windpipe) tube from larynx to lungs
slide4

Lungs

    • Bronchi: the 2 branches leading to the lungs
    • Bronchioles: smaller branches within each lung
    • Alveoli: small sacks surrounded by capillaries; gas exchange happens here
gas exchange
Gas exchange
  • Alveoli and capillaries
    • Blood cells in single file
  • Diffusion
    • High CO2 inside blood cells, low CO2 in alveolus
    • High O2 in alveolus, low O2 in blood cell
breathing
Breathing
  • Movement of air into and out of the lungs
  • Ventilation = inhalation + exhalation
  • Diaphragm
    • Contracts when inhaling (pulled down) lungs expand
    • Relaxes when exhaling (pushed up)  lungs push air out